# std::atomic_ref<T>::fetch_max

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< cpp‎ | atomic‎ | atomic ref

Provided only when `T` is an integral type other than cv bool or a pointer-to-object type |  |
value_type fetch_max( value_type arg, std::memory_order order = std::memory_order_seq_cst ) const noexcept; |  | (since C++26)

Atomically replaces the current value of the referenced object with the result of std::max of the value and arg. That is, it performs atomic maximum operation. The operation is a read-modify-write operation. Memory is affected according to the value of order.

If `T` is a pointer type and the pointers point to different complete objects (or subobjects thereof), pointer comparison does not establish a strict weak ordering.

This overload participates in overload resolution only if std::is_const_v<T> is false.

### Parameters

arg | - | the other argument of std::max
order | - | memory order constraints to enforce

### Return value

The value immediately preceding the effects of this function in the modification order of *this.

### Notes

Feature-test macro | Value | Std | Feature
--- | --- | --- | ---
`__cpp_lib_atomic_min_max` | `202403L` | (C++26) | Atomic minimum/maximum

### Example

| This section is incomplete Reason: no example

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